Zora Neale Hurston’s 1930s study of Haitian voodoo culture showed her a new category between life and death — When Zora Neale Hurston stepped ashore in Port-au-Prince, in September 1936, Haiti was in the middle of what local officials were calling its second independence. Since an armed revolution in 1791, which eventually threw off French rule, periods of relative stability had alternated with coups, assassinations, a peasant revolt, and…